Single insulator fuse mounting



J 2 1936- A. G. STEINMAYER SINGLE INSULATOR FUSE MOUNTING Filed June 9, 1934 INVENTOR ATTORNEY Patented Jan. 21, 1936 PATENT OFFICE SINGLE INSULATOR FUSE MOUNTING Alwin G. Steinmayer, Milwaukee, Wis., assignor to Line Material Company, South Milwaukee, Wis., a corporation of Delaware 13 Claims.

This invention relates to improvements in insulator supports for cutout switches.

It is an object of this invention to provide a single insulator for supporting an open type cutout switch.

It is also an object to provide a single insulator upon which the cutout mechanism of a switch may be mounted with a minimum contact upon the outer surface of the single insulator thereby decreasing the possible leakage between line terminals and the ground to a minimum.

Another object is to provide single insulator supports for cutout terminals so related that during the process of assembly, they automatically align themselves for switch operations and secure a rigid structure.

In other words, it is an object of this invention to provide an assembly which substantially eliminates all necessity for adjusting the elements relative to each other during the assembly work or thereafter.

Other objects will appear as the description progresses.

In the drawing Fig. l is'a view in side elevation showing an embodiment of this invention Fig. 2 is an enlarged sectional view taken on the line 2-2 of Fig. 1.

. Throughout the several views, like parts are mechanism upon the insulator as will more particularly appear hereafter.

The insulator support I comprises a cylindri- 40 cal piece of wet process porcelain having annular ribs 2 and a hollow interior 3 closed at the top 4. The top 4 is provided with a transversely extending hole or aperture 5 and the lower end of the insulator is provided with diametrically opposite 45 bolt holes or apertures 6. The intermediate portion of the insulator is provided with clamping elements 'I and 8 embracing the insulator and secured together by means of the bolt 9. The clamping element 8 is provided with an extension 50 I0 which is secured to the swivel arm II carried by the plates I2 and I3 secured clampingly to the swivel arm I I by means of the bolt I4. It will, 01 course, be understood that the plates I2 and I3 may be secured to the crossarm of a pole (not 65 shown).

Application June 9, 1934, Serial No. 729,805

Secured to the upper end of the insulator support I by means of a bolt 22 and nut 23 engaging the washer 24, is a connector plate I5 having a conductor receiving aperture I6 and a set screw II for engaging a conductor-in said aperture.

The bolt 22 passes through the plate I5 between the upright portions I9 of the horns, through the clamping block 20, and through the aperture 5 in the upper end of the insulator. The connector plate I5 serves as a clamp engaging the portions I9 which are disposed within the channel extending vertically on the outer face of the clamping block 20. The clamping block 20 is provided with an arcuate face substantially complementary to the outer periphery of the'insulator I. Thus, when the bolt clamps the elements indicated to the insulator, the block 20 is retained against roy tative movement by reason of its arcuate area engaging the complementary area on the insulator.

Thebolt 22 may be provided with a square end 25 adjacent the head of the bolt and receivable in the complementary square hole in the connector plate I5 and a similar hole in the block 20. Consequently, when the block 20 is clamped as indicated, it will prevent rotation or misalignment of the connector plate by reason of its engagement with the square end of the bolt which is likewise engaged by the connector plate.

The lower end of the insulator I is provided with a pivot supporting plate 28 secured to the insulator by means of the bolt 32 and nut 33 engaging the washer 34 on the insulator. 32 passes thru the upright portion of the supporting plate 28 and thru the block 3| which is similar to the block 20 previously described. To hold the support 28 against rotation, the upright portion 30 is seated in the vertically extending slot on the block 3|.

The pivot supporting end 29 of the plate 28 engages the connector tube 35 which is secured to the end 29 by means of set screw 36 which also serves to secure a conductor end within the tubular connector 35.

The connector tube 35 serves as a pivot for the fuse tube 40 which is mounted upon the connector by means of the collar 4| secured to the tube and having a pivot arm 42 secured to the pivot link 44 by means of the pivot pin 43. The link 44 is provided with pivot arms or fingers 45 engaged with the connector tube 35. The link 44 is provided with a contact arm to which the extending end of the fuse link 48 is secured by means of the bolt and nut 41.

The bolt The upper end of the fuse tube at is provided with a handle 52 and a cap 5!! having an axially projecting pin 53 engaged by the horns it as is more fully disclosed in the application previously referred to. For varying the tension with which the horns i8 engage the cap 56 and pin 53, a clamp 5!? is provided adjustable on the horns.

In operation, the cutout is closed by moving the fuse cartridge 46 about the connector tube 35 until the horns it are engaged with the cap 5i. When the fuse blows, the link 68 releases the supporting link 64 and the fuse cartridge moves downwardly in an endwise movement to withdraw the pin 53 from the horns it. The horns i8 will assist this downward movement of the fuse tube, and the link it, by reason of its pivotal connection with the tube and with the support,

will permit the free endwlse movement of the tube.

The foregoing noted operation is more fully disclosed in the application previously referred to and it is therefore deemed unnecessary to give a more detailed description of this operation herein.

The horns i 8 may be adjusted vertically on the block 20 by releasing the terminal plate 95 and then moving'the portions IQ of the arms endwise in the slot in the clamping block 20. When-the desired position is reached. the connector plate I 5 wilil be again clamped to the portions i9 as previously disclosed. I

It becomes apparent that the means for securing the mechanism to the insulator i is such that it will automatically be aligned for fuse operations when the parts are assembled. No adjustment about the axis of the insulator is required because the bolts and the clamping blocks 20-and 3! have a predetermined relationship. It will also be apparent that the blocks 20 and 3| and the washers 24 and 34 give a minimum contact surface of the metal parts with the insulator surface, thereby decreasing leakage quite substantially. It is also evident that the nmnber of parts required for assembling a cutout switch is reduced to a minimum.

Therefore, cutouts embodying the invention disclosed herein are cheaper to manufacture than similar prior art devices, give less leakage area between the contacting surfaces of metalparts and the insulator, simplify the assembly work at the factory, and require practically no adjusting after reaching the user's hands. I claim: f

1. In combination, a cylindrical insulator having adjacent each end a hole extending diametrically through the insulator and an intermediate portion for mounting the insulator, an apertured terminal block at each end of said insulator, contacts supported on said blocks, and a bolt ex tending through said insulator and blocks and securing them to said insulator, each of said blocks having one of its faces contacting the insulator and interlocked therewith.

2. In combination, a cylindrical insulator having adjacent each end a hole extending diametrically through the insulator and an intermediate portion for mounting the insulator, an apertured terminal block at each end of said insulator, contacts supp rted on said blocks, and a bolt passing through said insulator and blocks and seeming them to said insulator, said blocks having arcuate surfaces contacting and interlocking with complementary arcuate surfaces on said insulator, whereby to hold said blocks in a predetermined non-rotative relationship to the insulator.

3. In combination, a cylindrical insulator hav-- ing a bolt receiving hole extending diametrically therethrough, an apertured block having an arcuate face complementary to the face of the insulator and a grooved face extending longitudinally relative to the insulator, a. contact support positioned in said groove face, a bolt extending through said plate, hole and aperture and secured to the insulator.

4. In a switch mounting, an insulator block, a grooved mounting block having an aperture extending from and normalto the groove therein, a contact support positioned in said groove, a bolt passing through the aperture in said mounting block and securing the support in said groove and the mounting block on said insulator, whereby the support is held in said groove in nonrotative relation to the insulating block.

5. In a switch mounting, an insulator block, a grooved mounting block having an aperture extending from'and normal to the groove therein, a contact support positioned in said groove, a bolt passing through the aperture in said mounting block and securing the support in said groove and the mounting block on said insulator block, said insulator block and mounting block, having interlocking complementary contacting surface holding them against relative rotation. I

6. In. a switch mounting, an insulator block, a grooved mounting block having an aperture extending from and normal to the groove therein, a contact support positioned in said groove, a

terminal plate engaging the support, and a bolt extending through the plate, the aperture in 7. In a switch mounting, an insulator block,

a grooved mounting block, a contact support positioned in said groove, a terminal plate engaging the support, and a bolt extending through the plate, mounting block and insulator block, there,- by securing the support to the insulator block, said insulator block and mounting block having complementary arcuate surfaces, whereby the contact support is held in predetermined relationship to the insulator block.

8. In a cut-out switch, an insulator block, a grooved mounting block, a resilient contact comprising ,a pair of substantially parallel, spaced wires positioned ,in said groove, a plate engaging the wires, and a bolt passing through plate, between said wires, through said mounting block and secured to the insulator block, said insulator block and mounting block having complementary contacting arcuate faces interlocking to prevent relative rotation.

9. In a cut-out switch, an insulator block, a grooved mounting block, a pair of spaced contact arms positioned in said groove. and movable therein, a terminal plate engaging the arms in the groove, and a bolt passing through the plate, between said arms, through the mounting block and through the insulator block to secure the arms in justable relation to the last mentioned block.

10. In a cut-out switch, an insulator block, a grooved mounting block, a pair of spaced contact arms positioned in said groove and movable therein, a terminal plate engaging the arms in the groove, and a bolt passing through the plate, between said arms, through the mounting block and through the insulator block to releasably secure the arms for adjustment relative to the last mentioned block, said insulator block and QUE/8,491

ing, arcuate faces interlocking to prevent relative rotation,

11. In a cut-out switch, an insulator support, a mounting block, a contact arm mounted thereon, a terminal plate engaged with the arm, and a bolt securing the aforementioned elements to said support, said support and block having interlocking faces and said bolt being interlocked with said plate and block, whereby relative rotation and predetermined alignment of the enumerated elements is secured and maintained.

12. An insulating support for cut-out switches,

a said support comprising a hollow cylindrical insulator disposed with its axis extending vertically and closed at its upper end, said insulator having at each end bolt receiving holes extending transversely thereof and having an intermediate portion for attachment to a support.

13. m a cut-out switch, a. hollow cylindrical 5 tion of the insulator substantially equi-distant fromsaid terminals.

ALW'IN G. BTEINMAYER. 

